Device and method for achieving external dynamic compensation for display screen active area direct-current voltage drop

A DC voltage, dynamic compensation technology, applied in static indicators, circuits, electrical components, etc., can solve the problems of uneven display effect in the active area, great influence on the display brightness of the active area, and difficult to set the value accurately. Improve the display quality, the related circuit design is simple and easy to achieve

Active Publication Date: 2014-08-20
BOE TECH GRP CO LTD
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Problems solved by technology

Since the display brightness of the pixel unit of the OLED device is proportional to the square of the power supply voltage, the display brightness of the pixel unit of the OLED device is very sensitive to the change of the driving voltage signal in the low grayscale display state. This voltage drop, that is, IR drop, will cause The uneven display effect of th

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  • Device and method for achieving external dynamic compensation for display screen active area direct-current voltage drop
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  • Device and method for achieving external dynamic compensation for display screen active area direct-current voltage drop

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0031] Such as figure 1 as shown, figure 1 It is a schematic diagram of a display device including a display screen and an external device for dynamically compensating the DC voltage drop in the active area of ​​the display screen according to an embodiment of the present invention. The display device includes a display screen 1, an input signal comparator 2, a processor 3 and a voltage signal A modulation device 4, wherein the input signal comparator 2, the processor 3 and the voltage signal modulation device 4 are sequentially connected to form an external device for dynamically compensating the DC voltage drop in the active area of ​​the display screen, and the input signal comparator 2 and the voltage signal modulatio...

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Abstract

The invention discloses a device and method for achieving external dynamic compensation for display screen active area direct-current voltage drop. The device comprises an input signal comparator, a processor and a voltage signal modulating device. The input signal comparator is used for detecting current or voltage consumption of a current display frame on an ELVDD bus in real time, the detected current or voltage consumption is converted into digital signals which are output to the processor. The processor compares the received digital signals with the stored current or voltage consumption reference value of the current display frame in reference data information, a current or voltage compensation value which needs to conduct compensation on the current display frame is obtained, and the current or voltage compensation value is output to the voltage signal modulating device in a digital mode. The voltage signal modulating device generates an analog-form compensation voltage according to the received current or voltage compensation value and then feeds the compensation voltage back to an ELVDD lead, and the voltage is applied to each pixel unit through an ELVDD bus in an active area, so that external dynamic compensation for the display screen active area direct-current voltage drop is achieved.

Description

technical field [0001] The present invention relates to the field of active matrix organic light emitting diode (Active Matrix Organic Light Emitting Diode, AMOLED) display technology, in particular to an external device for dynamically compensating the DC voltage drop (IR drop) in the active area of ​​a display screen, having the external A display device for dynamically compensating a DC voltage drop device in an active area of ​​a display screen and an external dynamic compensation method for a DC voltage drop in an active area of ​​a display screen. Background technique [0002] In an AMOLED display system, the luminance of an organic light emitting diode (Organic Light Emitting Diode, OLED) is proportional to the driving current and the square of the driving voltage signal. Therefore, in the low grayscale display state, the luminance of the OLED is proportional to the The drive voltage signal is very sensitive to changes. In the AMOLED display system, because the IR dr...

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Application Information

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IPC IPC(8): G09G3/32G09G3/3225
CPCG09G3/32H10K59/00
Inventor 王颖张林涛刘铭
Owner BOE TECH GRP CO LTD
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